In an open letter to the prime minister, groups from the RSPB to Whale and Dolphin Conservation praised his work on the world stage pushing the green agenda.
But they said he needs to set the world an example in the run-up to the G7 summit of industrialised nations in Cornwall in June and the delayed Cop 26 climate summit in Glasgow in November.
Their State of Nature campaign called on him to insert a clause in the Environment Bill to give legal backing to his commitments to protect nature.
Warning that previous high-profile commitments by world leaders to protect the environment have failed, they urged the public to sign their petition.
The campaign is extremely important as it will buy and restore Horse Common to its former glory. This will bring back bird species that have been pushed out including providing homes to endangered species such as nightjar and spotted flycatcher. Both are rare in the UK due to a lack of sustainable habitat and suitable food. Restoring habitat brings back a large range of biodiversity, and restores the natural cycle within the forest.
The campaigner added: Nature and being outdoors is so important for positive mental health, especially during lockdown, and is helping millions.
Green Britain: Daily Express launches campaign with Ecotricity